Completed my trip to Arches and Canyonland. We stayed in Moab; which, is about 5 miles from the Arches south entrance and around 32 miles from Canyonland's northern entrance. Pretty much what I expected about not being e-bike friendly. No ebikes (or regular bikes or pets) on walking and hiking trails. E-bikes are considered motorized vehicles and are allowed on dirt trails or paved roads along with road cars and off road motor vehicles only.
Town of Moab:
Tourist town with a lot of restaurants, 1/2 day/full day/overnight 4X4 tours, 4X4 Jeep or Moab RZR Dune rentals, MTB rentals, day/overnight river raft, day/overnight MTB tours, or flying tours (hot air balloon or plane). Nice place to walk up and down main street to check out the town, eat, and window shop. This town lives on tourism and I can see the population 2X-4X on the weekends and holidays during prime tourism months. I would book a regular hotel, AirBnB, or VRBO now if you are thinking of staying anytime in the next few months on a weekend. Bikes are not allowed on main street sidewalks; but, there are paved bike paths in and around other areas of the city. You can even ride along a paved bike path paralleling the Colorado river for several miles located at the north end of town.
Arches:
The Park service was re-paving the roads and the northern end of the park was shut down (about 1/3 to 1/2 of the north end of park). I think they should be done with paving by mid-summer? There were other dirt access roads to those areas; but, you would need a 4X4 to reach them.
There was a 5 mile two lane paved bike path from Moab to Arches Visitor center. You had to share the road once you entered the park and there was a very steep 2-3 mile switchback climb to reach the first viewpoint (Park Ave viewpoint and trail-head). I would have used 2-3 bars of power on my Radrover if I had to ride up the switchback. The paved park roads are just wide enough for a RV with little to no shoulder for a biker to ride (no dirt shoulder to ride in at all). A driver would most likely have to cross the center line to pass a biker. Because of the distances between viewpoints on the paved roads; you will holding up traffic 20-40 cars deep because of the 2-way road volume if you ride your bike on the paved roads without pulling over to let them pass every few minutes.
Arches also had restricted hours from 7am-7pm instead of the 24/7 because of the construction. This pretty much overcrowded the areas accessible by paved roads from 12noon til closing (Park Ave Viewpoint, Courthouse towers, Garden of Eden, and Delicate Arch). Parking at each lookout and Arch formation was extremely limited. You will spend more time looking for a parking spot and walking to the Arch/lookout if you don't get there first thing in the morning.
There was just one main paved road that branched off to the different arches and overlook areas. I put around 50-60 miles on my car round-trip with 1/2 the park closed off. I would need 3 batteries and the full 12 hours to do the same trip on my Radrover.
Arches PDF map:
https://www.nps.gov/arch/planyourvisit/upload/archmap.pdf
Canyonland:
Looked like the road paving was already done to the northern half of the park. Canyonland had a northern entrance (32 mile ride from Moab) and a eastern entrance around 50 mile west of Monticello, UT. No connect to either half through the park and you have to drive around +130 miles on the hwy to get from one entrance to another. I didn't explore Canyonland from the lower eastern entrance (about 1/4 amount of paved roads compared to the northern part of park).
Pretty much repeat for road conditions and viewpoints as Arches. You need to get there early to find parking and take pictures without having 10-20 strangers in every frame. Canyonland had a lot more dirt roads for 4X4 travel and we saw more folks doing MTB overnight rides with a chase vehicle following. Only saw a few hard tail MTB and zero fat tire bikes on these tours. Most MTB tours were full suspension mid to top end bikes. The terrain was was too steep and rocky in places for my Radrover. Another factor was the distances of 20-40 miles just to get anywhere in Canyonland park. We were lucky to be there with temps in the mid 80s on one day and mid 60s the next two. Locals warned about temps easily reaching 100 degrees during the summer months on a normal day. We did a full day 4X4 tour of Arches and northern Canyonland and put around 140-150 miles that day. I think we put around 100 miles easily the next day in my car from Moab just viewing northern Canyonland main sites on the paved roads.
Canyonland PDF map:
https://www.nps.gov/cany/planyourvisit/upload/canymap.pdf